61 results about "Hexafluoride" patented technology

The invention discloses a fluorine removal agent with a fluorine ion absorption / desorption function through pH value regulation and control. The agent is of a core-shell structure. The agent mainly comprises a silica core and a metal organic framework shell layer which covers a silica surface and is provided with pore paths, wherein silica particles are spherical or irregular in shape, and the particle size is 100-5000 nanometers; and the pore size of the pore paths of the shell layer is between the diameters of a hydrated fluorine ion and a hydrated silicon hexafluoride ion. The invention further discloses a preparation method of the fluorine removal agent. The fluorine removal agent has the fluorine ion absorption / desorption function through pH value regulation and control. The fluorine removal agent can greatly absorb the fluorine ions in the water under the acid condition, and the fluorine ions which are greatly absorbed by the fluorine removal agent can be greatly desorbed under the alkaline condition. The method has the characteristics of accurately controlled thickness, pore path structure and pore size of the metal organic framework shell layer, and is low in preparation equipment investment, simple in technology and easy to operate.

The invention provides a method for purifying butadiene hexafluoride. The method comprises the following steps: pumping pure water, adsorption resin, a graphene oxide aqueous solution and potassium borohydride into a reaction kettle, heating to reaction temperature and stirring, performing filtering, drying and heating roasting at the end of the reaction, and cooling to room temperature to obtain an efficient adsorbent; performing an impurity removal rectification technology which is publically known in the industry, including performing an extraction technology, on a coarse butadiene hexafluoride product to separate out a solvent, then adsorbing by a molecular sieve to remove water, putting into an adsorption tower with the efficient adsorbent, adjusting to proper reaction temperature, pressure and flowing rate for adsorption, performing the impurity removal rectification technology which is publically known in the industry again, including decompression rectification, on adsorbed fluorine-containing organic gas, and removing impurities to obtain a high-purity butadiene hexafluoride product.

The invention discloses a sulphur hexafluoride breaker having a heating protection device and capable of normally working in the outdoor circumstance having low temperature (below minus 30 DEG C). The breaker is provided with an insulating sealing shell (1) in which an upper insulating pull rod (2), a lower insulating pull rod (3) and an upper contact (4), a lower contact (5) respectively fixed at front ends of the insulating pull rod (2) and the lower insulating pull rod (3) are provided; a temperature sensing element (7) and an electrothermal element (8) are provided below a lateral insulating board (6) which is provided below the lower contact (5); bottom panel of the insulating sealing shell (1) is provided with a temperature sensing element binding post (9) connected with the temperature sensing element (7) and an electrothermal element binding post (10) connected with the electrothermal element (8); the temperature sensing element binding post (9) and the electrothermal element binding post (10) are connected with a temperature control circuit provided outside the insulating sealing shell (1).

The invention discloses a water removal method for silicon tetrafluoride, and belongs to the field of fluorine chemical and electronic industry gas. The method comprises the following steps: introducing silicon tetrafluoride, diluent gas and carbonyl fluoride in a water removal tower filled with a filler, carrying out a reaction through the contact of the carbonyl fluoride and water in the silicon tetrafluoride, removing the water in the silicon tetrafluoride to obtain a product 1; carrying out condensation treatment on the product 1 to obtain a product 2; carrying out adsorption and low-temperature fractionation treatment on the product 2 in sequence; and collecting the silicon tetrafluoride to complete water removal of the silicon tetrafluoride. The water removal method is simple in operation; the water in the silicon tetrafluoride can be effectively removed; and through detection, the purity of the silicon tetrafluoride product is as high as 99.999%, water is not detected, and the content of hexafluoride disiloxane ((SiF3)2O) is as low as at most 20 ppb.

The invention relates to the field of inorganic functional materials, and discloses Mn<4+>-doped hexafluoride red fluorescent powder and a synthesis method thereof. The chemical composition of the Mn<4+>-doped hexafluoride red fluorescent powder is [(CH3)4N]2A<1-x>F6:xMn<4+>, wherein the x is the molar percentage coefficient of the correspondingly doped Mn<4+> ions relative to the A<4+> ions, andthe x is greater than 0 and less than or equal to 0.10; the A is one of Si, Ge and Ti. The red light-emitting material disclosed by the invention is mainly used for emitting red light of about 630 nmunder the excitation of blue light, and is high in light-emitting efficiency. The preparation method of the red light-emitting material is a liquid phase method, is carried out at normal temperature,is simple in synthesis process, and is suitable for large-scale industrial production.

The invention discloses an on-line monitoring device of the sulphur hexafluoride circuit breaker for knowing the operating state of the breaker and the rejected region in time, reducing the fault incidence rate, increasing the work efficiency of the breaker and safety, increasing the repair pertinence and reducing the maintenance cost. The monitoring device is provided with a vibration frequency sensor and the vibration frequency sensor is connected with a singlechip microcomputer IC by a signal processing circuit A and a display circuit and an alarm circuit are connected with the singlechip microcomputer IC.

The invention discloses a chromium-free passivator for shot blasting components for die-cast aluminum, a method for preparing the chromium-free passivator and a method for applying the same. The chromium-free passivator comprises 0.5-5% of ammonium zirconium hexafluoride, 0.05-0.5% of ammonium metavandate, 0.01-1% of citric acid, 0.1-5% of magnesium nitrate, 0.5-3% of cobalt monosulfate heptahydrate, 0.05-0.5% of ammonia water and the balance water. The chromium-free passivator and the methods have the advantages that a stable passivation film can be formed on the surface of each shot blasting component for the die-cast aluminum, is firm, dense and stable and is high in corrosion resistance and free of sediments, excellent film forming effects can be realized, passivated workpieces appear natural metal colors after shot blasting is carried out, and corroded areas are not larger than 10% of the total areas of the workpieces as shown by 24h bare neutral salt spray tests; high binding force can be generated between the chromium-free passivator and different types of coat, and the chromium-free passivator passes impact tests and cross tests; coatings are free of bubbling and falling in the neutral salt spray tests after being coated for 500h; the chromium-free passivator is free of trivalent chromium or hexavalent chromium or other heavy metal elements, is nontoxic, pollution-free, non-flammable and non-explosive and is excellent in environmental friendliness.

Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and the fluorides are recovered using a difference in volatility behavior. The spent oxide fuel is subjected to a reaction with an HF gas, whereby uranium, plutonium and most impurities are converted into solid fluorides having low valences or remained as oxides to inhibit volatilization thereof, and then in an F2 fluorination step, the HF fluorination product is subjected to a reaction with a fluorine gas in two stages: one at a low temperature and the other at a high temperature, whereby a certain amount of gaseous uranium and volatile impurities are separated with plutonium kept in a solid form in the first stage, and mixed fluorides of remaining uranium and plutonium are fluorinated into hexafluorides at the same time in the second stage. By such a reprocessing method, plutonium enrichment can be adjusted, uranium and plutonium can be purified, and steps are simplified as well. In addition, reactors are hard to be corroded or deteriorated.

The invention relates to the technical field of nuclear fuel transportation systems, and in particular, discloses a container for natural uranium hexafluoride transportation. The container for natural uranium hexafluoride transportation comprises a cylinder, a left seal and a right seal, wherein two ends of the cylindrical cylinder are fixedly sealed through the left seal and the right seal with standard elliptic structures; a thick wall skirt base is arranged on the left seal; a valve is arranged on the left seal; a thin wall skirt base is arranged on the right seal; and a plug is arranged on the right seal. The container for natural uranium hexafluoride transportation can satisfy the performance test requirements after free fall in the radioactive substance safe transportation management regulation.

The invention belongs to the technical field of manufacturing technologies of semiconductor integrated circuits and discloses an atomic layer deposition device. The atomic layer deposition device comprises a substrate, a heating base, a gas supply pipe, a plasma pipe and a vacuum pump. Meanwhile, the invention discloses an atomic layer deposition method. The atomic layer deposition method includes the steps that firstly, NF3 and NH3 are conveyed into a cavity between a silicon wafer and the substrate; then plasma is introduced into the cavity to convert the NF3 and the NH3 into fluorinated ammonia and ammonia difluoride; the fluoride and a silicon dioxide film react to form ammonia hexafluoride; and then the ammonia hexafluoride is heated to be decomposed into gas and finally dissociated from a deposition cavity. By means of the atomic layer deposition device and method, the problems that an existing back cleaning technology is long in cleaning time and not thorough in cleaning are solved. The method is easy and convenient to implement, can be compatible with the existing technology, and has the beneficial effects of being low in cost, easy to implement and the like.

The invention discloses a low-toxicity synthesis method of a siloxane gas-sensitive material, which takes liquid 2-ethylenic alkyl hexafluoride isopropyl alcohol as a raw material at the normal temperature, and the siloxane gas-sensitive material can be prepared by the addition reaction between the raw material and hydrogen-containing siloxane under the catalysis of divinyl tetramethyl disiloxaneplatinum coordination, so that hexafluoroacetone which is high in toxicity and is gaseous at the normal temperature can be avoided. The preparation method is simple in method, easy to operate, mild in reaction condition, lower in requirements for experimental facilities and lower in material toxicity, and can simply, practically and efficiently introduce hexafluoro-isopropanol substituent group into silicon hydrogen bond of the hydrogen-containing siloxane.

The invention discloses a purifying method of aromatic methylene hexafluoride compound, which comprises the following steps: a) providing composite solvent with at least one soluble true solvent of aromatic methylene hexafluoride compound and at least one soluble non-solvent of aromatic methylene hexafluoride compound; b) dissolving aromatic methylene hexafluoride compound in the composite solvent to form solution; c) cooling; d) reducing solution temperature to obtain crystal-solution compound; filtering; washing; drying; crystallizing.

An experimental device of manual pressure source for testing multiple fluid pressure volume temperature relationship comprises a manual pressure generator and a measuring apparatus, the mercury working fluid and sealing liquid. The lower an upper ends of the measuring apparatus are conical, the middle part of the apparatus is cylindrical. The measuring apparatus comprises glass flange capillary, constant temperature circulating water jacket, a sealing liquid container lid, a seal liquid container, a seal, a constant temperature circulating water jacket fixed structure, a vacuum valve, a charging valve, a pressure gauge and a bolt and other accessories, the measuring apparatus is conveniently filling with high purity fluid which comprises carbon dioxide, hexafluoride, ethane, freon 13, freon 23, the manual pressure generator is connected with the measuring apparatus by pressure metal pipe and sleeve joint. The device has the advantages of completely solving the hidden troubles of air leakage, oil leakage and operation errors caused by hydraulic oil not using of a pressure gauge validator ,testing multiple fluid property and being convenient to use.

The invention relates to the field of inorganic functional materials and discloses a Mn (IV)-activated red hexafluoride light-emitting material capable of being effectively excited by blue light and a preparation method of the material. The Mn (IV)-activated red hexafluoride light-emitting material capable of being effectively excited by the blue light has the chemical composition being Cs2Hf(1-x)F6:xMn<4+>, wherein x is the molar percentage coefficient of correspondingly doping Mn<4+> relative to Hf<4+>, and x is larger than 0 and smaller than or equal to 0.10. The red light-emitting material mainly emits red light at 631 nm under the excitation of the blue light and has high light emitting efficiency. The preparation method of the high-color-purity red oxyfluoride light-emitting material excited by the blue light is a liquid phase method, adopts a simple synthesis process and is suitable for large-scale industrial production.

The invention discloses a composite material of ionic liquid functionalized carbon nanotubes. Ionic liquid imidazolyl is cation; iodine ions, boron tetrafluoride, phosphorus hexafluoride and bis(trifluoromethanesulfonyl)imine are used as anions respectively; ionic liquid is directly connected onto surfaces of the carbon nanotubes through a covalent bond and no other atoms are used for connecting the ionic liquid and the carbon nanotubes. The invention further discloses a preparation method of the composite material; amino functionalized carbon nanotubes, formaldehyde, glyoxal and ammonium acetate are mixed in methanol to react. Then iodomethane is added into a product to finally obtain methylimidazole iodine salt functionalized carbon nanotubes. Then other ionic liquid functionalized carbon nanotubes are obtained through anion exchange. The composite material disclosed by the invention is used as a hydrogen evolution catalyst and is applied to electrolytic water; the ionic liquid modified carbon nanotubes have excellent hydrogen evolution catalytic activity and ionic liquid also can have the effect of a bonding agent.

The invention provides a kind of synthetic method of novel quaternary ammonium hexafluorophosphate ionic liquid polymer, that is: poly(p-vinylbenzyl-triethyl quaternary ammonium hexafluorophosphate), which first uses triethylamine and p- Chloromethylstyrene is subjected to quaternization reaction, then ion-exchanged with potassium hexafluorophosphate to obtain monomer, and finally poly(p-vinylbenzyl-triethyl quaternary ammonium hexafluorophosphate) is obtained through free radical polymerization. The ionic liquid polymer has good thermal stability and high glass transition temperature, and can be used for the capture of harmful gases such as carbon dioxide, sulfur dioxide, formaldehyde, and dioxin, the solid-phase extraction and separation of sulfur and nitrogen heterocyclic compounds in oil products, and Solid phase electrolyte materials and other fields.

The invention discloses a universal environment-friendly non-phosphorus phosphating solution, which comprises the following components in percentage by weight: 3 to 5 percent of ammonium zirconium hexafluoride, 5 to 7 percent of nitric acid, 1.5 to 2 percent of boric acid, 0.4 to 0.6 percent of ethylene diamine tetraacetic acid, 3 to 3.4 percent of sodium nitrite, 1 to 2.5 percent of zinc molybdate and the balance of water. An adhesion test and a salt spray test show that the non-phosphorus phosphating solution has a good effect on improvement in the adhesion force of a metal substrate and a surface coating, the adhesion force obtained by the adhesion test is over 1 grade, and the adhesion force obtained by the salt spray test can be maintained for 1,000 hours; and the non-phosphorus phosphating solution is convenient to prepare and significant for environmental protection.

The invention discloses a purifying method of 1, 1, 1, 3, 3, 3-hexafluoride isopropanol (HFIP) catalyzed and hydrogenated by hexafluoroacetone (HFA), which is characterized by the following: removing partial water and impurity from rough product of HFIP; adding non-volatile soluble inorganics to rectify; improving impurity to 99.9%.

The invention belongs to the technical field of exhaust-gas purification and discloses a TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent. The TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent comprises, by weight, 70% of strontium hydroxide, 28% of calcium hydroxide and 2% of epoxy resin. The method includes the steps of S1, selection of raw materials; S2, smashing and vibration mill; S3, raw material weighing; S4, kneading; S5, extrusion; S6, drying; S7, capability test; S8, product packing. The TX-GF-JH-6 type boron trichloride and boron hexafluoride exhaust-gas purification absorbent is simple in formula, chemical adsorption is derived from traditional physical adsorption of activated carbon, and harmless calcium salt, inorganic salt and the like which are stable are generated after adsorption reaction with corresponding gases; the absorbent can be directly used in road repairing, pit filling, refuse dumping and the like, secondary pollution cannot caused, simpleness in production technology is achieved, and effect can be well achieved.

The invention discloses an organic light emitting device, which comprises a substrate, an anode, a hole transmission layer, an electron blocking layer, a light emitting layer, an electron transmission layer, an electron injection layer and a cathode stacked sequentially. Material of the hole transmission layer comprises poly-3-hexylthiophene and a dopant doped in the poly-3-hexylthiophene, wherein the dopant is at least one selected from 2, 3, 5, 6-tetrafluoro-7, 7 ', 8, 8'-tetracyanoquino-dimethane, 1, 3, 4, 5, 7, 8-hexafluoride-tetracyano-dimethyl naphthalene quinine, 2, 2'-(2, 5-dicyano-3, 6-difluorocyclohexane-2, 5-diene-1, 4-di idene) di-malononitrile and 2, 3, 6, 7, 10, 11-hexacyano-1, 4, 5, 8, 9, 12-hexaazatriphenylene. The light emitting efficiency of the organic light emitting device is high. The invention also provides an organic light emitting device manufacturing method.

The invention discloses a quick environment-friendly phosphorus-free phosphating solution. The quick environment-friendly phosphorus-free phosphating solution comprises the following components in percentage by weight: 4 to 6 percent of ammonium zirconium hexafluoride, 5 to 7 percent of hydrofluoric acid, 1 to 1.5 percent of boric acid, 0.1 to 0.2 percent of ethylene diamine tetraacetic acid, 0.5 to 1.5 percent of zinc molybdate and the balance of water. Through a cross-cut tape adhesion test, the phosphorus-free phosphating solution can reach more than one grade in the aspect of increasing the adhesion of a metal base and a surface coating; through a salt spray resistance test, the salt spray resistance time of the phosphorus-free phosphating solution can reach 1,000 hours; and the phosphorus-free phosphating solution is convenient to prepare and has significance to environment friendliness.

The invention discloses a tetrastyrene macrocyclic compound with force-induced fluorescence color changing performance. The compound is connected with an alkyl chain structural unit through the strongfluorescence property of the tetrastyrene macrocyclic compound, so that the tetrastyrene macrocyclic compound has the fluorescence color difference performance before and after the solid increases the pressure, and can be used as a fluorescence probe to identify cyclic carboxylic acid. The structural formula of the tetrastyrene macrocyclic compound is shown in a formula 1 or a formula 2, whereina connecting bridge R is 1,4-butylene (-(CH2)4-),2,2,3,3-tetrafluoro-1,4-butylene (-CH2 (CF2) 2CH2-),1,5-pentyl (-(CH2)5-2,2,3,3,4, 4-hexafluoride-1, 5-amylidene(-CH2(CF2)3CH2-)-1, 6-hexylylene((-CH2)6-) or 2,2,3,3,4,4,5,5-octafluoride-1,6-hexylylene(CH2(CF2)4CH2-).

The invention discloses silicone rubber with a low compression deformation rate. The silicone rubber comprises the following raw materials in parts by weight: 2 to 3 parts of poly (butyl acrylate), 0.5 to 1 part of Iron (III) 2-ethylhexanoate, 0.3 to 0.6 part of calcium hexafluoroacetyl-acetonate, 4 to 5 parts of polyvinylidene fluoride, 0.8 to 1 part of polydimethylsiloxane, 1 to 2 parts of ammonium zirconium hexafluoride, 2 to 3 parts of calcium fluoride, 0.4 to 1 part of diphenyl imidazoline, 6 to 10 parts of acetyl tributyl citrate, 1 to 2 parts of a promoter TL, 20 to 30 parts of silicon ash powder, 1 to 2 parts of rosin, 0.6 to 1 part of ammonium zirconium carbonate, 100 to 106 parts of methyl phenyl vinyl silicone rubber, 1 to 2 parts of 2, 5- dimethyl-2, 5-bi(tert butyl peroxide) hexane, and 3 to 5 parts of a rare earth additive. The silicone rubber has the advantages of high resilience and low compression set property, high surface strength, good resistance, strong corrosion and aging resistance, good applicability to the environment, and wide application range.

The present invention relates to a method for preparing nanoparticles by using laser and more particularly, a method for preparing nanoparticles by irradiating a laser beam to the mixture of a source material gas and a hexafluoride (SF6) catalyst gas, thereby improving the production yield of nanoparticles with energy saved. More particularly, the present invention provides the method for preparing the nanoparticles by using the laser wherein the laser beam of wavelength having the excellent energy absorption by the mixture gas of source material gas and catalyst gas is irradiated to the mixture gas so as to increase the reactivity of the source material gas with energy saved, which brings the effects of solving the problems of damaging environment due to the unreacted toxic source material gas incurred by the low production yield of the conventional nanoparticle preparation method and of making system complicated with the high cost when the discarded source gas is recovered and reused.

The invention discloses a multi-element fluoride material with a hollow tetrakaidecahedron structure. The multi-element fluoride material is prepared by adopting the following steps: stirring three metal nitrate solvents in deionized water so as to obtain a clear aqueous solution; adjusting the pH value of the solution by using dilute nitric acid and ammonia water to a certain value, then adding a fluoride solution, violently stirring for 10 minutes, finally transferring the mixture to a reaction kettle, heating the mixture for 2-4 hours at a certain temperature, collecting a product, and drying the product for 10 hours at the temperature of 80 DEG C. The multi-element fluoride material has internal pore diameters, thin crystal walls and enormous application prospect; the preparation technology is simple and is suitable for industrial production; the raw materials are inexpensive and easily available.

The invention discloses a light-homogenization modified macromolecular injection molding material which is prepared from the following raw materials by weight: 1.4 to 2 parts of an oxidant 168, 1 to 1.2 parts of a light stabilizer 770, 100 to 130 parts of ABS PA757, 2 to 4 parts of light calcium carbonate, 5 to 7 parts of caprolactam, 2 to 3 parts of oxalic acid, 0.1 to 0.3 part of gamma-aminopropyl-triethoxysilane, 1.7 to 2 parts of polyvinylpyrrolidone, 0.1 to 0.3 part of acetylacetone hexafluoride, 1 to 2 parts of acetylated lanolin, 2 to 4 parts of sodium dodecyl sulfate, 0.5 to 1 part of fatty acid macrogol ester, 0.2 to 0.5 part of alkylated diphenylamine, 5 to 6 parts of dioctyl azelate, 0.3 to 1 part of zinc naphthenate and 4 to 5 parts of micro silica aerogel. The finished product of the light-homogenization modified macromolecular injection molding material is extremely high in transparency, surface hardness and impact strength, high in resistance to yellowing and oxidization, and excellent in comprehensive performance.

The invention discloses a fiber-modified antioxidant geogrid. The fiber-modified antioxidant geogrid comprises the following raw materials in parts by weight: 0.7 to 1 part of calcium fluoride, 3 to 4 parts of polyurethane, 10 to 17 parts of poly propyleneimine, 6 to 8 parts of tert-Butyl acrylate, 0.1 to 0.3 part of lithium aluminium hydride, 0.3 to 1 part of 4-dimethylamino pyridine, 0.4 to 1 part of an antioxidant 1010, 10 to 15 parts of multiwalled carbon nanotube, 0.6 to 1 part of an antioxidant 1680, 140 to 160 parts of high-density polyethylene, 2 to 3 parts of cellulose propionate, 1 to 2 parts of sodium carboxymethyl cellulose, 0.3 to 1 part of polydimethylsiloxane, 2 to 3 parts of ammonium zirconium hexafluoride, 0.1 to 0.2 part of pyromellitic dianhydride, 1 to 2 parts of tetrahydrofurfuryl alcohol, and 10 to 13 parts of calcined kaolin. According to the fiber-modified antioxidant geogrid, cellulose propionate and sodium carboxymethyl cellulose are added, so that the dispersity of fillers in a polymer can be effectively improved, and as a result, the intensity of a finished product can be improved.

Fluorine or a fluorine compound is subjected to a reaction with a spent oxide fuel to produce fluorides of uranium and plutonium, and the fluorides are recovered using a difference in volatility behavior. The spent oxide fuel is subjected to a reaction with an HF gas, whereby uranium, plutonium and most impurities are converted into solid fluorides having low valences or remained as oxides to inhibit volatilization thereof, and then in an F2 fluorination step, the HF fluorination product is subjected to a reaction with a fluorine gas in two stages: one at a low temperature and the other at a high temperature, whereby a certain amount of gaseous uranium and volatile impurities are separated with plutonium kept in a solid form in the first stage, and mixed fluorides of remaining uranium and plutonium are fluorinated into hexafluorides at the same time in the second stage. By such a reprocessing method, plutonium enrichment can be adjusted, uranium and plutonium can be purified, and steps are simplified as well. In addition, reactors are hard to be corroded or deteriorated.

The invention discloses a sea-buckthron-oil-containing aluminum alloy surface treatment agent, which comprises the following raw materials in parts by weight: 0.1-0.3 part of trichloroisocyanuric acid (TCCA), 1-2 parts of ammonium zirconium hexafluoride, 0.3-0.5 part of glyceryl monostearate, 0.2-0.3 part of an antioxidant 1010, 0.1-0.5 part of sea buckthorn oil, 1-2 parts of hexamethylphosphoric triamide, 2-3 parts of ammonia chloride, 1-2 parts of extylene diamine tetra (mextylene phosphonic acid) sodium, 2-3 parts of sorbic alcohol, 0.2-0.4 part of molybdenum boride, 3-4 parts of a film forming aid, 12-19 parts of 3-aminopropyl trimethoxysilane and 100-130 parts of deionized water. According to the sea-buckthron-oil-containing aluminum alloy surface treatment agent, the raw materials are safe and good in environmental protection, the traditional harmful constituents such as nitrate are nonexistent, damage to human bodies and the environment is avoided, the treatment method is simple, and the formed coating is even and level and high in adhesion strength.

The invention relates to a preparation method of rhenium hexafluoride, which belongs to the technical field of fluorine chemical industry. In this method, the rhenium powder and nitrogen trifluoride mainly generate a mixture of rhenium hexafluoride and rhenium heptafluoride by adjusting the fluorination reaction conditions, and the disproportionation reaction of other valence rhenium fluorides can be basically avoided; The reaction conditions are such that rhenium heptafluoride reacts with rhenium powder to form rhenium hexafluoride, preventing rhenium heptafluoride and rhenium hexafluoride from being reduced to rhenium fluoride in a lower valence state. The method of the invention has the advantages of simple operation, safety and economy, high synthesis conversion rate, and the prepared rhenium hexafluoride has a purity higher than 90 wt%.